Wearable computing device and user interface method

ABSTRACT

There are disclosed a wearable computing device and a method for a user interface. The wearable computing device includes a drowsiness detection unit configured to detect a user&#39;s drowsiness; a controller configured to determine whether a current situation corresponds to a first mode not allowing the user&#39;s drowsiness or a second mode allowing the user&#39;s drowsiness when the user&#39;s drowsiness is detected; and a feedback output unit configured to provide the user with at least one feedback comprising a message of the first mode or the second mode according to the mode determined by the controller, wherein the message of the first mode is to fight off the drowsiness and wherein the message of the second mode is to help the user&#39;s sleep.

Pursuant to 35 U.S.C. §119(a), this application claims the benefit ofearlier filing date and right of priority to Korean Application No.10-2013-0116709, filed on Sep. 30, 2013, the contents of which arehereby incorporated by reference herein in their entirety.

BACKGROUND OF THE DISCLOSURE

1. Field of the Disclosure

The present specification relates to a wearable computing device whichmay be put on at least one body part of a user, more particularly, awearable computing device which may be put on a human face and a userinterface method associated with sleepiness in the face wearablecomputing device.

2. Discussion of the Related Art

Among wearable computing devices, a wearable computing device which canbe put on a human head or face is referred to as “Head Mounted Display(HMD)” or “Face Mounted Display (FMD).

Such a wearable computing device may be combined with augmented realitytechnology and N screen technology and provide various conveniences to auser.

In addition, the wearable computing device may be used in connectionwith various external digital devices. Such the wearable computingdevice implements communication with the various external digitaldevices to receive a user input for a corresponding external digitaldevice or to perform works in communication with a correspondingexternal digital device.

(a), (b), (c) and (d) of FIG. 1 show examples of the wearable computingdevice configured to be put on a user's head or face. As shown in (a),(b), (c) and (d) of FIG. 1, there are a variety of wearable computingdevices and any types of wearable computing devices may be applied tothe present disclosure. For example, a glass type computing device shownin (a) of FIG. 1, a sunglass type computing device shown in (b) of FIG.1 and a hair-band type computing device may be applicable.

The wearable computing device shown in (a), (b), (c) and (d) of FIG. 1provides images and/or sounds to a user, using a display and/or aspeaker. Especially, a small-sized display device (e.g., a liquidcrystal display) provided in the wearable computing device is typicallyarranged adjacent to at least one of eyes and the wearable computingdevice projects an image to the display device.

SUMMARY OF THE DISCLOSURE

Exemplary embodiments of the present disclosure provide a wearablecomputing device which may warn a user's sleepiness or help sound sleepin accordance with a situation determined whether the user is allowed tosleep once sensing the user's sleepiness and a user interface method ofthe same.

To achieve these objects and other advantages and in accordance with thepurpose of the present specification, as embodied and broadly describedherein, a wearable computing device may include a drowsiness detectionunit configured to detect a user's drowsiness, a controller configuredto determine whether a current situation corresponds to a first mode notallowing the user's drowsiness or a second mode allowing the user'sdrowsiness when the user's drowsiness is detected, and a feedback outputunit configured to provide the user with at least one feedbackcomprising a message of the first mode or the second mode according tothe mode determined by the controller. Herein, the message of the firstmode is to fight off the drowsiness and the message of the second modeis to help the user's sleep.

The drowsiness detection unit may detect the user's drowsiness, using atleast one of the user's eye blinking, the user's eye closing time, astate of the user's eyes, the user's pulsation, the user's brainwave,the user's body temperature and a line of the user's vision.

The wearable computing device may further include a Global PositioningSystem (GPS) unit configured to receive location information of thewearable computing device from one or more GPSs, and a camera unitconfigured to capture images in a range corresponding to the user's lineof vision and/or images of the user's surrounding, using one or morecameras.

The controller may determine whether the user is driving using one ormore of the images captured by the camera unit, the location informationreceived from the GPS unit and information sensed by one or more sensor,and the controller may determine that the current situation iscorresponding to the first mode when the user is driving based on theresult of the determination.

The controller may detect the user's location and place using one ormore of the images captured by the camera unit, the location informationreceived from the GPS unit and the information sensed by one or moresensors when the user is not driving based on the result of thedetermination, and the controller may determine whether the currentsituation corresponds to the first mode or the second mode based on thedetected location and place.

The first mode and the second mode may be manually using at least one ofa button, a menu and a voice command provided in the wearable computingdevice.

The at least one feedback comprising the message of the first mode maycomprise at last one of a first audio feedback, a first alarm feedback,a first video feedback and a first brainwave feedback, and the at leastone feedback comprising the message of the second mode may comprise atleast one of a second audio feedback, a second alarm feedback, a secondvideo feedback and a second brainwave feedback.

The feedback output unit may comprise an audio output unit configured tooutput one of the first audio feedback and the second audio feedbackbased on the control of the controller, an alarm output unit configuredto output one of the first alarm feedback and the second alarm feedbackbased on the control of the controller, a display unit configured tooutput one of the first video feedback and the second video feedbackbased on the control of the controller, and a brainwave output unitconfigured to output one of the first brainwave feedback and the secondbrainwave feedback based on the control of the controller.

The feedback provided to the user by the feedback output unit to fightoff the drowsiness and the message of the first mode included in thefeedback may be determined by learning of the wearable computing device.

The feedback provided to the user by the feedback output unit to fightoff the drowsiness and the message of the first mode included in thefeedback may be determined by the user.

The feedback provided to the user by the feedback output unit to helpthe user's sleep and the message of the second mode included in thefeedback may be determined by learning of the wearable computing device.

The feedback provided to the user by the feedback output unit to helpthe user's sleep and the message of the second mode included in thefeedback may be determined by the user.

The controller may control a brightness of lighting near the user basedon whether the current situation corresponds to the first mode or thesecond mode, using a wireless communication function.

The controller may convert a mode of the wearable computing device intoa standby mode when the current situation corresponds to the secondmode.

The controller may provide the user with a feedback comprising adifferent message of the first mode when the user's drowsiness isdetected after the feedback comprising the message of the first mode isprovided to the user for a preset time period.

The controller provides the user with a feedback comprising a differentmessage of the second mode, when the user's sleep is not detected afterthe feedback comprising the message of the second mode is provided tothe user.

The controller may provide the user with the feedback comprising themessage of the second mode when a mode conversion is requested by theuser while the feedback comprising the message of the first mode isprovided to the user.

The controller may provide the user with the feedback comprising themessage of the first mode when a mode conversion is requested by theuser while the feedback comprising the message of the second mode isprovided to the user.

In another aspect, a method of a user interface for a wearable computingdevice may include detecting whether a user is drowsy, determiningwhether a current situation corresponds to a first mode not allowing theuser's drowsiness or a second mode allowing the user's drowsiness whenthe user's drowsiness is detected, and providing the user with at leastone feedback comprising a message of the first mode or the second modeaccording to the mode determined in the step. Herein the message of thefirst mode may be to fight off the drowsiness and wherein the message ofthe second mode may be to help the user's sleep.

Additional advantages, objects, and features of the presentspecification will be set forth in part in the description which followsand in part will become apparent to those having ordinary skill in theart upon examination of the following or may be learned from practice ofthe present specification. The objectives and other advantages of thepresent specification may be realized and attained by the structureparticularly pointed out in the written description and claims hereof aswell as the appended drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

(a), (b), (c) and (d) of FIG. 1 illustrate embodiments of variouswearable computing devices;

FIG. 2 is a block diagram of a wearable computing device according toexemplary embodiments of the present disclosure;

FIG. 3 illustrates a wearable computing device which includes abrainwave sensor and a vibrator according to one embodiment of thepresent disclosure;

FIG. 4 is a flow chart illustrating a user interface method of thewearable computing device according to an embodiment of the presentdisclosure;

FIG. 5 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure;

FIG. 6 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure;

FIG. 7 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure;

FIG. 8 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure;

FIG. 9 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure;

FIG. 10 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure; and

FIG. 11 is a flow chart illustrating a user interface method of thewearable computing device according to another embodiment of the presentdisclosure.

DESCRIPTION OF SPECIFIC EMBODIMENTS

Exemplary embodiments of the disclosed subject matter are described morefully hereinafter with reference to the accompanying drawings. Thedisclosed subject matter may, however, be embodied in many differentforms and should not be construed as limited to the exemplaryembodiments set forth herein. Rather, the exemplary embodiments areprovided so that this disclosure is thorough and complete, and willconvey the scope of the disclosed subject matter to those skilled in theart. In the drawings, the size and relative sizes of layers and regionsmay be exaggerated for clarity. Like reference numerals in the drawingsdenote like elements.

It will be understood that when an element or layer is referred to asbeing “on”, “connected to”, or “coupled to” another element or layer, itcan be directly on, connected, or coupled to the other element or layeror intervening elements or layers may be present. In contrast, when anelement is referred to as being “directly on”, “directly connected to”,or “directly coupled to” another element or layer, there are nointervening elements or layers present. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items. It may also be understood that for the purposesof this disclosure, “at least one of X, Y, and Z” can be construed as Xonly, Y only, Z only, or any combination of two or more items X, Y, andZ (e.g., XYZ, XYY, YZ, ZZ).

It will be understood that, although the terms first, second, third etc.may be used herein to describe various elements, components, regions,layers, and/or sections, these elements, components, regions, layers,and/or sections should not be limited by these terms. These terms areonly used to distinguish one element, component, region, layer, orsection from another region, layer or section. Thus, a first element,component, region, layer, or section discussed below could be termed asecond element, component, region, layer, or section without departingfrom the teachings of the present disclosure.

The terminology used herein is for the purpose of describing exemplaryembodiments only and is not intended to be limiting of the disclosedsubject matter. As used herein, the singular forms “a”, “an”, and “the”are intended to include the plural forms as well, unless the contextclearly indicates otherwise. It will be further understood that theterms “comprises” and/or “comprising,” when used in this specification,specify the presence of stated features, integers, steps, operations,elements, and/or components, but do not preclude the presence oraddition of one or more other features, integers, steps, operations,elements, components, and/or groups thereof.

Exemplary embodiments of the disclosed subject matter are describedherein with reference to cross-section illustrations that are schematicillustrations of idealized embodiments (and intermediate structures) ofthe disclosed subject matter. As such, variations from the shapes of theillustrations as a result, for example, of manufacturing techniquesand/or tolerances, are to be expected. Thus, exemplary embodiments ofthe disclosed subject matter should not be construed as limited to theparticular shapes of regions illustrated herein but are to includedeviations in shapes that result, for example, from manufacturing.

Unless otherwise defined, all terms (including technical and scientificterms) used herein have the same meaning as commonly understood by oneof ordinary skill in the art to which this disclosed subject matterbelongs. It will be further understood that terms, such as those definedin commonly used dictionaries, should be interpreted as having a meaningthat is consistent with their meaning in the context of the relevant artand will not be interpreted in an idealized or overly formal senseunless expressly so defined herein.

The present disclosure is to detect a user's sleepiness (or drowsiness)by using the wearable computing device and to provide the user with afeedback in accordance with each of situations so as to warn drowsinessor help sleep based on the result of the detecting. Specifically, whenthe situation does not allow the user to be drowsy, the wearablecomputing device provides the user with at least one feedback so as tofight off sleepiness. When the situation allows the user to fall asleep,the wearable computing device provides the user with at least onefeedback helpful to sleep.

At this point, the feedback is a message type feedback provided to theuser with reference to each of the situations. There may be an audiofeedback, a visual feedback, an alarm feedback and a brainwave feedback,and so on.

In an embodiment of the present disclosure, each of feedbacks includestwo mode messages. For description convenience, the situation notallowing the user's drowsiness may be a first mode and the situationallowing the user's drowsiness may be a second mode. That is for helpingthe present disclosure understood completely and the reverse of theorder may be possible.

In other words, a message for the first mode may include at least one ofaudio, video, brainwave and alarm feedbacks. A message for the secondmode may include at least one of audio, video, brainwave and alarmfeedbacks. Two feedbacks corresponding to each mode have two differentmessages. For example, the audio feedback included in the message forthe first mode may be calming music and the audio feedback included inthe message for the second mode may be loud music.

In the present disclosure, the message for the first mode is referred toas a message for drowsiness warning and the message for the second modeis referred to as a message for sleep helping.

It is assumed in the present disclosure that the user is putting on thewearable computing device to detect whether or not the user is drowsy,to determine the first/second mode, and to provide the user with afeedback according to the determined mode.

FIG. 2 is a block diagram of a wearable computing device 220 accordingto one embodiment of the present disclosure. The wearable computingdevice 220 may include a controller 221, a communication unit 222, acamera unit 223, a storage unit 224, a sensor unit 225, a GPS unit 226,a drowsiness detection unit 227, an audio output unit 228, an alarmoutput unit 229 and a display unit 230. The wearable computing devicemay further include a brainwave output unit 231. One or more externaldigital devices 210 configured to provide data (e.g., contents) may beconnected to the communication unit 222 of the wearable computing device220 via a wire or wirelessly.

The controller 221 included in the wearable computing device 220 mayimplement an application (or a program) and process data of the wearablecomputing device. In addition, the controller 221 may control thecommunication unit 222, the camera unit 223, the storage unit 224, thesensor unit 225, the GPS unit 226, the drowsiness detection unit 227,the audio output unit 228, the alarm output unit 229 and the displayunit 230. The controller 221 may also manage data transmission betweentwo of the units.

According to an embodiment of the present disclosure, the controller 221checks whether the situation allows the user to be drowsy when thedrowsiness detection unit 227 detects the user's drowsiness, andcontrols one corresponding unit to provide the user with at least onefeedback based on the result of the checking.

According to an embodiment of the present disclosure, it is detected bythe drowsiness detection unit 227 whether the user is drowsy. However,According to another embodiment of the present disclosure, the user'sdrowsiness may be detected by the controller 221. In contrast, thedrowsiness detection unit 227 may detect whether the user is drowsy anddetermine whether the situation allows the user's drowsiness when theuser's drowsiness is detected. Hence, the drowsiness detection unit 227may control the corresponding units to provide the user with at leastone feedback based on the result of the determination.

The operations of the controller 221 and the drowsiness detection unit227 may be performed by hardware, a firmware, a middleware or a softwareor combination of at least two of them.

The communication unit 222 is connected to the external digital device210 via a wire or wirelessly. Any devices configured to provide thewearable computing device 220 with video/audio data may be the externaldigital device 210. For example, the external digital device 210 may bea mobile terminal or a fixed terminal. Examples of the mobile terminalmay include a cellular phone, a smart phone, a tablet PC (PersonalComputer), a smart pad, a notebook, a digital broadcasting terminal, PDA(Personal Digital Assistant), PMP (Portable Multimedia Player), adigital camera or a navigator. Examples of the fixed terminal mayinclude a desk top, DVD (Digital Video Disc or Digital Versatile Disc)player and TV.

The communication unit 222 and the external digital device 210 maytransmit/receive data via a wire or wirelessly using various protocols.For example, in case that they transmit/receive data via a wire, HDMI(High Definition Multimedia Interface) or DVI (Digital Visual Interface)may be supported. In case that they transmit/receive data wirelessly,2G, 3G and 4G mobile communication system interfaces may be supported.Examples of 2G, 3G and 4G mobile communication interfaces may includemobile communication system (e.g., GSM (Global System for MobileCommunication), CDMA (Code Division Multiple Access), Wibro, HSPA (HighSpeed Packet Access), HSDPA (High Speed Downlink Packet Access), LTE(Long Term Evolution)), Bluetooth, and short range communication systems(e.g., IrDA (Infrared Data Association), UWB (Ultra Wideband), Zigbee,WLAN (Wireless LAN) (WiFi)).

The wire/wireless interface systems are examples for helping the presentdisclosure understood easily and the interface methods fortransmitting/receiving information may be easily modified by peopleskilled in the art. Accordingly, the interface method according to theembodiments of the present disclosure may not be limited to theembodiments.

The camera unit 223 captures (or photographs or takes) an image near thewearable computing device and converts the captured image into anelectric signal. For that, the camera unit 223 may include an imagesensor and the image sensor may convert an optical signal into anelectric signal. The image converted into the electric signal aftercaptured by the camera unit 223 may be stored in the storage unit 224before being output to the controller 21 or output to the controller 221without stored in the storage unit 224. In addition, the camera unit 223captures an image located in a range corresponding to the user's viewand converts the captured image into an electric signal. The convertedelectric signal is stored in the storage unit 224 and output to thedrowsiness detection unit 227, or directly output to the drowsinessdetection unit 227 without stored in the storage unit 224. The imagecaptured by the camera unit 223 may be a still image or a motionpicture.

Applications (or programs) for the operation of the controller 221 maybe stored in the storage unit 224 or the image acquired by the cameraunit 223 may be stored in the storage unit 224. Audio data, photographs,video data, applications and various contents may be stored in thestorage unit 224.

Examples of the storage unit 224 may include RAM (Random Access Memory),SRAM (Static Random Access Memory), ROM (Read Only Memory), EEPROM(Electrically Erasable Programmable Read Only Memory) and PROM(Programmable Read Only Memory). The wearable computing device 220 maybe driven in association with web storage for implementing the storagefunction of the storage unit 224 on the internet.

The storage unit 224 may further include an external storage mediadetachably mounted to the wearable computing device 220. The externalstorage media may be a slot type storage media (e.g., a SD (SecureDigital) memory and a CF (Compact Flash) memory), a memory stick type orUSB (Universal Serial Bus). In other words, any storage mediademountable from the wearable computing device 220 and configured toprovide the wearable computing device with contents (e.g., audio data,photographs, video data and applications) may be provided as theexternal storage media.

The sensor unit 225 may transmit the environment recognized by thewearable computing device 220 to the controller 221, using a pluralityof sensors arranged in the wearable computing sensor 220. At this time,the sensor unit 220 may include a plurality of sensing means. In oneembodiment, the plurality of the sensing means may include a gravitysensor, a terrestrial magnetism sensor, a motion sensor, a gyro sensor,an acceleration sensor, an infrared ray sensor, an inclination sensor, abrightness sensor, a height sensor, an olfactory sensor, a temperaturesensor, a depth sensor, a pressure sensor, a bending sensor, an audiosensor, a video sensor and a touch sensor.

The pressure sensor of the sensing means may detect whether a pressureis applied to the wearable computing device 220 and the size of thepressure. The pressure sensor module may be provided in any areas of thewearable computing device 220 which require pressure detection accordingto use environment.

The motion sensor detects the position or movement of the wearablecomputing device 220. The acceleration sensor used in the motion sensormay be a device configured to convert change in acceleration in onedirection into an electric signal and such the acceleration sensor isbroadly used together with development of MEMS (Micro-electromechanicalSystems). There are many types of acceleration sensors including onetype mounted in an air-back system of a vehicle to measure a large valueof acceleration used in sensing crash, another type configured tomeasure a small value of acceleration used as input means of a game andthe like by recognizing minute movement of a human hand and othervarious types. The gyro sensor is a sensor configured to measure anangular velocity and it can sense a direction of rotation with respectto a reference direction.

The sensor unit 225 may further include a brainwave sensor configured tomeasure a brainwave of the user and to provide the measured brainwave tothe drowsiness detection unit 227.

The brainwave sensor measures a brainwave from the user's scalp andoutputs the measured brainwave signal to the drowsiness detection unit227. At this time, the brainwave may be classified into LPF, EcoG andEEG (Electroencephalogram) based on a measuring place and a type of abrainwave. According to an embodiment of the present disclosure, thebrainwave sensor may measure an EEG signal generated in the user'sscalp.

One or more brainwave sensors may be provided and arranged in an area ofthe wearable computing device 220 that can contact with the user'sscalp.

The infrared ray sensor measures an infrared ray emitted from the userand outputs the measured infrared ray to the drowsiness detection unit227.

In the embodiments of the present disclosure, the sensor unit 227 mayrefer to the sensing means mentioned above and sense the user's variousinput and user environment, to transmit the result of the sensing to thecontroller 221 such that the controller 221 can implement operationscorresponding to the result of the sensing. The sensors mentioned abovemay be included in the wearable computing device 220 as independentelements or combined into one or more elements.

The GPS (Global Positioning System) unit 226 receives locationinformation of the wearable computing device 220 from a plurality of GPSsatellites and provides the received location information to thecontroller 221.

The drowsiness detection unit 227 detects whether the user is in adrowsy state based on the image captured by the camera unit 223 and/orthe result of the sensing performed by the sensor unit 225, and then itoutputs the result of the detection to the controller 221.

The drowsiness detection unit 227 may detect whether the user is drowsyusing one or more sources. For example, one or more sources may beinformation on the user's eye blinking, the time when the user isclosing the eyes, a state of the user's eyes, pulsation, brainwaves, atemperature, EMG, ECG, EOG and the user's gaze, the drowsiness detectionunit 227 may detect the user's drowsiness based on one or more sources.

In one embodiment, the drowsiness detection unit 227 may determinewhether the user is drowsy based on the images in a range correspondingto the user's view which are captured by the camera unit 223 and aposition of the user's pupil.

In another embodiment, the drowsiness detection unit 227 identifies abandwidth the user's brainwave signals measured by the brainwave sensorbelongs to and detects whether the user is in a drowsy state based onthe result of the checked bandwidth. The brainwave generated by electricactivity of nerve cells in the cerebral cortex may be categorized into adelta wave (0.5˜3.99 Hz), a theta wave (4˜7.99 Hz), an alpha wave(8˜12,99 Hz), a beta wave (13˜29.99 Hz) and a gamma wave (30 Hz or more)based on a bandwidth they belongs to. There can be generated adifference between frequencies according to a state of the brain. Inother words, beta waves are more than the others in an arousal state andthe alpha waves are more than the others in a state where the mind andbody are stabilized or the eyes are closed. The theta waves are morethan the others in a state the user enters into a light sleep and thedelta waves are more in a state the user enters into a deep sleep state.In a transmission period between an awakening state before sleeping anda sleeping state, the human enters into a mentally stabilized state andthe eye-close time is increasing such that the alpha waves can be morethan the other waves. The theta waves remains as they were or gettingrelatively less because of the alpha wave increasing. Such a phenomenonof the theta waves in the awakening state and the sleeping state may beused as a reference of brainwave drowsiness determination. In otherwords, the bandwidth of the brain waves measured by the brain wavesensor of the sensor unit 225 may be analyzed and the types of the brainwaves are figured out based on the result of the analysis. In thisinstance, it can be determined whether the user is drowsy at the currenttime. Also, the drowsiness detection unit 227 may determine whether theuser is in a sleep state based on the bandwidth of the brainwaves.

In one embodiment, the drowsiness detection unit 227 may detect theuser's drowsiness based on the eye blinking information. The eyeblinking information includes at least one of an eye-blinking frequencyand eye-blinking period. The eye blinking information may be detectedfrom digital information on the user's brain waves measured by the brainwave sensor of the sensor unit 225. Generally, the human eye-blinkingfrequency per unit time is increasing in a pre-sleep state than in theawakening state and the frequency is drastically decreasing in the sleepstate, such that the eye closed time can be increasing. The eye blinkingfrequency is in inverse proportion to the eye blinking period.Accordingly, the eye blinking period in the pre-sleep state is reducingand the eye blinking period in the sleep state is increasing. When thedrowsiness is detected by the eye blinking frequency, the eye blinkingfrequency has to be calculated with putting it on hold to determinedrowsiness and it is difficult to take appropriate steps for the user'sdrowsiness. When the drowsiness is detected by the eye blinking period,the before eye blinking and the current eye blinking have to be put intoconsideration and there is one advantage that the user's drowsinessstate can be reflected in the drowsiness determining in real time.Accordingly, it is preferred that the eye blinking period is used as thereference of the drowsiness determination. At this time, thecharacteristic can be used that the eye blinking period is decreasing inthe pre-sleep state and increasing in the sleep state.

In one embodiment, the drowsiness detection unit 227 may detect theuser's drowsiness based on the user's body temperature calculated fromthe infrared ray measured by the infrared ray sensor of the sensor unit225. For example, when the calculated body temperature is lower than theuser's average body temperature by a predetermined value or more, it maybe determined that the user is drowsy.

In one embodiment, the drowsiness detection unit 227 may detect theuser's drowsiness based on both the eye blinking information and theuser's brain wave.

The embodiments for detecting the user's drowsiness are disclosed tomake the present disclosure understood easily and the user's drowsinessmay be detected based on other various sources.

The information on the result of the user's drowsiness detectionperformed by the drowsiness detection unit 227 may be output to thecontroller 221.

The controller 221 may determine whether the user is allowed to bedrowsy or not allowed to be drowsy, when the user's drowsiness isdetected by the drowsiness detection unit 227.

In the present disclosure, the situation where the user is not allowedto be drowsy may be referred to as “a first mode” and the situationwhere the user is allowed to be drowsy as “a second mode” forconvenience sake.

At this time, there are various methods for determining whether thecurrent mode is a first mode or a second mode. In one embodiment, it isdetermined whether it is the first mode or the second mode, using one ormore of the user's movement and location information. For that, thecontroller 221 may use the images of surroundings captured by the cameraunit 223, the location information received from the GPS unit 226 andthe sensing information output by the sensor unit 225. For example, whenit is determined the user is at the wheel, the mode is set as the firstmode which not allows the user to be drowsy. In one embodiment, evenwhen the speed at which the user is moving is corresponding to the speedof the vehicle, it cannot be absolutely determined that the user is atthe wheel and it is additionally determined whether the user is at thewheel based on the user's current location the image of the surrounding.Specifically, the user can be moving in a seat not at the wheel or in abus.

The controller 221 may set the current mode as the first mode or thesecond mode, once determining that the user is moving not the driving.Even once determining that the user is not moving, the controller 221may set the mode as the first mode or the second mode based on theuser's current location and place. For example, when the user is in alecture room to take a lecture, the controller 221 determines thecurrent mode as the second first mode not allowing the user to bedrowsy. When the user is at home, the controller 221 determines thecurrent mode as the first mode allowing the user to be drowsy. Even inthe same condition, it can be the situation not allowing the user'sdrowsiness or the situation allowing the user's drowsiness. For that,information on various situations categorized for the first mode and thesecond mode may be provided to a manufacturer or the user to store theinformation in the storage unit 224. The information may be used indetermining whether it is set as the first mode or the second mode. Asanother example, the mode may be the first mode or the second mode basedon the learning of the wearable computing device 220. As a furtherexample, when it is the situation makes it difficult to determinewhether the mode is set as the first mode or the second mode, the firstmode may be set and feedbacks corresponding to the first mode may beprovided to the user. At this time, the user may be change the mode,using a button or a menu.

When detecting the use's drowsiness, the controller 221 mentioned abovedetermines whether the current mode is set as the first mode notallowing the user's drowsiness or the second mode allowing the user'sdrowsiness, using the various methods and sources mentioned above. Afterthat, the controller controls a corresponding unit to provide the userwith at least one feedback corresponding to the determined mode. Inother words, when the determined mode is the first mode, the controllerprovides at least one feedback for shaking off the drowsiness via acorresponding unit. When the determined mode is the second mode allowingthe user's drowsiness, the controller provides the user with at leastone feedback for helping sound sleep via a corresponding unit.

Here, the feedback is a message type provided to the user according toeach of the situations. There may be an audio feedback provided to theuser via the audio output unit 227, a visual feedback provided via thedisplay unit 230, an alarm feedback provided via the alarm output unit229 and a brainwave feedback provided via the brainwave output unit 231.

Especially, in the embodiment of the present disclosure, there may betwo mode messages for each of the feedbacks. In other words, a messagefor the first mode may include one or more of the audio feedback, thevideo feedback, the brainwave feedback and the alarm feedback. A messagefor the second mode may also include one or more of the audio feedback,the video feedback, the brainwave feedback, the alarm feedback. Twocorresponding feedbacks in each of the modes have a different message.For example, the audio feedback included in the message for the firstmode may be calming music and the audio feedback included in the messagefor the second mode may be loud music.

In the present disclosure, the one or more feedbacks which will beprovided to the user according to the determined mode and the messageprovided by the one or more feedbacks may be preset in the wearablecomputing device 220 or automatically set by learning, or they may bedirectly set by the user. In the case where the feedbacks and themessage are automatically set by the learning, it is determined that thebest effect is achieved when “A” music is output in the first mode asthe audio feedback, the audio output unit 228 is controlled to output“A” music as the audio feedback. “A” music may be pre-stored in thestorage unit 224 or provided from the external digital device 210.

The audio feedback is described to make the present disclosureunderstood easily and the audio feedback, the brainwave feedback and thealarm feedback may be provided, similar to the audio feedback.

The audio output unit 228 outputs an audio signal of the contentsimplemented in the wearable computing device 220. The contents may beprovided from the storage unit 224 or the external digital device 210.Also, the contents may be provided from the camera unit 223.

The audio output unit 228 may include one or more of an air conductionspeaker and a bone conduction speaker.

The bone conduction speaker may be arranged in various positions forproviding an audio signal converted into frequency type vibration. Whenusing the bone conduction speaker, the audio signal drives the boneconduction speaker and a bone conduction sound wave is conduced to theuser's skull and the frequency type vibration is transmitted to theuser. When using the bone conduction speaker, the user can hear theaudio signal without damage to the eardrum.

Examples of the air conduction speaker include an earphone. The airconduction generates a sound wave by vibrating air according to an audiosignal. In other words, the vibration of the sound transmitted to theair may be transmitted to the eardrum in the user's ear and thevibration of the eardrum is transmitted to a screw-shaped cochlea viathree bones located in the eardrum. The cochlea is filled with lymphfluid and vibration of the lymph fluid is converted into an electricsignal and transferred to the auditory nerve, such that a human braincan recognize sound.

The audio output unit 228 may output the audio feedback of the firstmode to warn the drowsiness or the audio feedback of the second mode tohelp sound sleep according to the control of the controller 221.

Examples of the message provided by the audio feedback of the first modemay include a loud music or song, a loud noise, a voice of the personwho the user is afraid of or dislikes (e.g., the user's superior), aspecific signal sound. The mention like “Don't be drowsy” or “Wake up”made by the person the user usually dislikes or fears may be used.

Examples of the message provided by the audio feedback of the secondmode may include a calming music or song and a sound of the nature.

When an event requiring notification to the user is generated, the alarmoutput unit 229 may transmit notification to the user, using an alarm.The alarm may be a tactile feedback or vibration. The tactile feedbackunit uses ultrasonic vibrations and it can control a vibration frequencyand a vibration size.

The alarm output unit 229 may output an alarm feedback of the first modefor warning drowsiness or an alarm feedback of the second mode forhelping sound sleep according to the control of the controller 221.

A message provided by the alarm feedback of the first mode may be atactile feedback which gives a sting sensation to the user to fight offthe drowsiness.

A message provided by the alarm feedback of the second mode may be atactile feedback which gives a soft sensation to the user to help soundsleep.

The display unit 230 output a video signal of the contents implementedin the wearable computing device 220. The contents may be provided byone of the external digital device 220, the camera unit 223 and thestorage unit 224. Examples of the display unit 230 may include a liquidcrystal display, a thin film transistor liquid crystal display, a lightemitting diode, an organic light emitting diode, a flexible display and3D display. Also, the examples of the display unit 230 may include theair and transparent glass. In other words, any materials capable ofvisually transmitting the video signal to a person may be the displayunit 230.

The display unit 230 may output a video feedback of the first mode forwarning drowsiness or a video feedback of the second mode for helpingsound sleep according to the control of the controller 221.

Examples of a message provided by the video feedback of the first modemay include a flashy painting, a photograph and a motion picture forshaking off the drowsiness.

Examples of a message provided by the video feedback of the second modemay include a painting, a calming scenery photograph and a motionpicture for helping sound sleep.

The brain wave output unit 231 may output a brain wave feedback of thefirst mode for warning the drowsiness or a brain wave feedback of thesecond mode for helping the sound sleep according to the control of thecontroller 221.

Examples of a message provided by the brain wave feedback of the firstmode may include an alpha wave in frequency bandwidth range of 8 Hz˜13Hz to fight off drowsiness.

Examples of a message provided by the brain wave feedback of the secondmode may include a theta wave in a frequency bandwidth range of 4 Hz˜7Hz to help sound sleep.

FIG. 3 is a wearable computing device according to one embodiment of thepresent disclosure. Brain wave sensors 351 and 352 for measuring a brainwave and vibrators 361 and 362 may be arranged in both legs of thewearable computing device, respectively. The arrangement is one ofembodiments and they may be any portions of the wearable computingdevice which can measure the user's brain wave and transmit vibration tothe user. The number of the brain wave sensors and the number of thevibrators are one of the embodiments to help the present disclosureunderstood easily and the present disclosure is not limited to theembodiment mentioned above.

FIG. 4 is a flow chart of a user interface according to one embodimentfor the wearable computing device.

Once the user's drowsiness of detected (S401), it is determined whetherthe current situation is corresponding to the first mode not allowingthe user's drowsiness or the second mode allowing the user's drowsiness(S402). The method of detecting the user's drowsiness and the method ofdetermining the mode are described in detail above and omittedaccordingly.

When the current mode is determined as the first mode in the step ofS402, the feedback of the first mode for warning the drowsiness isprovided to the user (S403). The feedback of the first mode may be oneof the audio feedback, the video feedback, the alarm feedback and thebrain wave feedback. At this time, the message provided by each of thefeedbacks is described in detail above and omitted accordingly.

When the current mode is determined as the second mode, the feedback ofthe second mode for helping the user's sound sleep is provided to theuser (S404). The feedback of the second mode may be one of the audiofeedback, the video feedback, the alarm feedback and the brain wavefeedback. At this time, the message provided as each of the feedbacks isdescribed in detail above and omitted accordingly.

FIG. 5 is a flow chart of a user interface according to anotherembodiment of the wearable computing device, especially, a flowchartwhen the feedback provided to the user is the audio feedback.

Specifically, once the user's drowsiness is detected (S501), it isdetermined whether the current situation is corresponding to the firstmode not allowing the user's drowsiness or the second mode allowing theuser's drowsiness (S502). The method of detecting the user's drowsinessand the method of determining the mode are described in detail above andomitted accordingly.

When the current mode is determined as the first mode in the step ofS502, the audio feedback of the first mode for warning the drowsiness isprovided to the user (S503). The message provided by the audio feedbackof the first mode may be the loud music or song, the loud sound, thevoice of the person the user usually dislikes or fears (e.g., a boss) orthe specific signal sound to fight off the drowsiness. At this time, themention like “Don't be drowsy” or “Wake up” made by the person the userusually dislikes or fears may be used.

When the current mode is determined as the second mode in the step ofS502, the audio feedback of the second mode for helping the user's soundsleep is provided to the user (S504). The message provided by the audiofeedback of the second mode may be the calming music or song or thesound of the nature for helping the sound sleep.

FIG. 6 is a flow chart of a user interface method according to a furtherembodiment for the wearable computing device, especially, a flow chartof a user interface when the feedback provided to the user is the videofeedback.

Specifically, once the user's drowsiness is detected (S601), it isdetermined whether the current situation is corresponding to the firstmode not allowing the drowsiness or the second mode allowing thedrowsiness (S602). The method of detecting the user's drowsiness and themethod of determining the mode are described in detail above and omittedaccordingly.

When the current mode is determined as the first mode in the step ofS602, the video feedback of the first mode for warning the drowsiness isprovided to the user (S603). The message provided by the video feedbackof the first mode may be the flashy photograph, painting, motion picturefor fighting off the drowsiness.

When the current mode is determined as the second mode in the step ofS502, the video feedback of the second mode for helping the user's soundsleep is provided to the user (S504). The message provided by the videofeedback of the second mode may be the calming painting, photograph ormotion picture.

FIG. 7 is a flow chart illustrating a user interface according to astill further embodiment for the wearable computing device, especially,a flow chart of a user interface when the feedback provided to the useris the alarm feedback.

Specifically, once the user's drowsiness of detected (S701), it isdetermined whether the current situation is corresponding to the firstmode not allowing the user's drowsiness or the second mode allowing theuser's drowsiness (S702). The method of detecting the user's drowsinessand the method of determining the mode are described in detail above andomitted accordingly.

When the current mode is determined as the first mode in the step ofS402, the alarm feedback of the first mode for warning the drowsiness isprovided to the user (S703). The message provided by the alarm feedbackof the first mode may be the tactile feedback which gives a stingingsensation to shake off the drowsiness.

When the current mode is determined as the second mode in the step ofS702, the alarm feedback of the second mode for helping the user's soundsleep is provided to the user (S704). The message provided by the alarmfeedback of the second mode may be a tactile feedback which gives a softsensation to help the user's sound sleep.

FIG. 8 is a flow chart illustrating a user interface according to astill further embodiment for the wearable computing device, especially,a flow chart of a user interface when the feedback provided to the useris the brainwave feedback.

Specifically, once the user's drowsiness of detected (S801), it isdetermined whether the current situation is corresponding to the firstmode not allowing the user's drowsiness or the second mode allowing theuser's drowsiness (S802). The method of detecting the user's drowsinessand the method of determining the mode are described in detail above andomitted accordingly.

When the current mode is determined as the first mode in the step ofS802, the brainwave feedback of the first mode for warning thedrowsiness is provided to the user (S803). The message provided by thebrainwave feedback of the first mode may be the alpha wave in thefrequency bandwidth range of 8 Hz˜13 Hz to fight off the drowsiness.

When the current mode is determined as the second mode in the step ofS802, the brainwave feedback of the second mode for helping the user'ssound sleep is provided to the user (S804). The message provided by thebrainwave feedback of the second mode may be the theta wave in thefrequency bandwidth range of 4 Hz˜7 Hz to help the sound sleep.

FIG. 9 is a flow chart illustrating a user interface according to astill further embodiment for the wearable computing device, especially,a flow chart of a user interface when two or more feedbacks are providedto the user.

Specifically, once the user's drowsiness is detected (S901), it isdetermined whether the current situation is corresponding to the firstmode not allowing the user's drowsiness or the second mode allowing theuser's drowsiness (S902). The method of detecting the user's drowsinessand the method of determining the mode are described in detail above andomitted accordingly.

When the current mode is determined as the first mode in the step ofS902, two or more feedbacks of the first mode for warning the drowsinessare provided to the user (S903). The two or more feedbacks of the firstmode may be two of more of the audio feedback, the video feedback, thealarm feedback and the brainwave feedback. For example, the audiofeedback and the alarm feedback of the first mode may be provided to theuser simultaneously. At this time, the message provided by each of thefeedbacks is described in detail above and omitted accordingly.

When the current mode is determined as the second mode in the step ofS902, two or more feedbacks of the second mode for helping the user'ssound sleep are provided to the user (S904). The two or more feedbacksof the second mode may be two or more of the audio feedback, the videofeedback, the alarm feedback and the brainwave feedback. For example,the audio feedback and the alarm feedback of the first mode may beprovided to the user simultaneously. At this time, the message providedby each of the feedbacks is described in detail above and omittedaccordingly.

FIG. 10 is a flow chart illustrating a user interface according to astill further embodiment for the wearable computing device.

Specifically, once the user's drowsiness is detected (S1001), it isdetermined whether the user is moving (S1002). The method of detectingthe user's drowsiness and the method of determining the mode aredescribed in detail above and omitted accordingly.

When the user is moving based on the result of the determination in thestep of S1002, it is determined whether the user is at the wheel(S1003). When the user is at the wheel based on the result of thedetermination, one or more feedbacks of the first mode are provided tothe user to warn the drowsiness (S1004). The one or more feedbacks ofthe first mode are one or more of the audio feedback, the videofeedback, the alarm feedback and the brainwave feedback. At this time,the message provided by each of the feedbacks is described in detailabove and omitted accordingly.

When the user it not at the wheel based on the result of thedetermination in the step of S1003, it is determined whether the currentsituation is corresponding to the first mode or the second mode based onthe user's location and/or the user's place (S1005). When the currentmode is the first mode based on the result of the determination in thestep of S1005, the step of S1004 is implemented and one or morefeedbacks of the first mode for warning the drowsiness are provided tothe user.

When the current situation is corresponding to the second mode based onthe result of the determination in the step of S1005, one or morefeedbacks of the second mode for helping the sound sleep are provided tothe user (S1006). The one or more feedbacks of the second mode are oneor more of the audio feedback, the video feedback, the alarm feedbackand the brainwave feedback. At this time, the message provided by eachof the feedbacks is described in detail above and omitted accordingly.

When the user is not moving based on the result of the determination inthe step of S1002, it is determined whether the current situation iscorresponding to the first mode or the second mode based on the user'slocation and/or place (S1007).

When the current mode is the first mode based on the result of thedetermination in the step of S1007, the step of S1004 is implemented andone or more feedbacks of the first mode for warning the drowsiness areprovided to the user.

When the current mode is the second mode based on the result of thedetermination in the step of S1007, one or more feedbacks of the secondmode for helping the sound sleep are provided to the user (S1008).

Using one or more of the images of the surrounding captured by thecamera unit 223, the location information received from the GPS unit226, the sensing information sensed by the sensor unit 225, it may bedetermined whether the user is moving, whether the user is at the wheelonce the user is moving based on the result of the determination,whether the user is not at the wheel while moving or what is the user'scurrent location or place once the user is not moving.

FIG. 11 is a flow chart illustrating a user interface according to astill further embodiment for the wearable computing device.

Specifically, once the user's drowsiness is detected (S1101), it isdetermined whether the current situation is the first mode not allowingthe drowsiness or the second mode allowing the drowsiness (S1102). Themethod of detecting the user's drowsiness and the method of determiningthe mode are described in detail above and omitted accordingly.

When the current situation is corresponding to the first mode based onthe result of the determination in the step of S1102, one or morefeedbacks of the first mode for warning the drowsiness are provided tothe user (S1103). The one or more feedbacks of the first mode may be oneor more of the audio feedback, the video feedback, the alarm feedbackand the brainwave feedback. At this time, the message provided by eachof the feedbacks is described in detail above and omitted accordingly.

One a predetermined time period passes while the one or more feedbacksof the first mode are provided to the user (S1104), it is detected againwhether the user is drowsy (S1105). The one or more feedbacks of thefirst mode may be provided to the user for a preset time periodcontinuously or in a preset time period intermittently.

When the user's drowsiness is detected in the step of S1105, it isdetermined that the one or more feedbacks provided in the step of S1103are not effective in fighting off the user's drowsiness. One or morestronger feedbacks of the first mode than those provided in the step ofS1103 are provided to the user (S1106). In one embodiment, the feedbackprovided in S1103 may be different from the feedback provided in S1106.For example, when the feedback provided in S1103 is the audio feedback,the feedback provided in S1106 may be the brainwave feedback. In anotherembodiment, when the feedback provided in S1103 may be the same as thefeedback provided in S1106. For example, when the feedback provided inS1103 is the audio feedback, the feedback provided in S1106 may be alsothe audio feedback and the message provided by the audio feedback ofS1106 comprises stronger contents than the message provided by the audiofeedback of S1103. For example, the message provided by the audiofeedback of S1106 is the sounds of Kkwanenggari, the message provided bythe audio feedback of S1103 may be sounds of rapping on a desk.

Meanwhile, when the current situation is corresponding to the secondmode based on the result of the determination in S1102, one or morefeedbacks of the second mode for helping sound sleep are provided to theuser (S1107). The one or more feedbacks of the first mode may be one ormore of the audio feedback, the video feedback, the alarm feedback andthe brainwave feedback. The message provided by each of the feedbacks isdescribed in detail above and omitted accordingly.

Once a predetermined time period passes while the one or more feedbacksof the second mode are provided to the user (S1108), it is determinedwhether the user is sleeping (S1109). The one or more feedbacks of thesecond mode may be provided to the user for a preset time periodcontinuously or within a preset time period intermittently.

When it is detected that the user is not sleeping in S1109, it isdetermined that the one or more feedbacks provided in S1107 are noteffective in helping the user's sound sleep. Accordingly, one or morestronger feedbacks of the second mode than the one or more feedbacksprovided in S1107 are provided to the user (S1110). In one embodiment,the feedback provided in S1107 may be different from the feedbackprovided in S1110. For example, when the feedback provided in S1107 isthe audio feedback, the feedback provided in S1110 may be the brainwavefeedback. In another embodiment, when the feedback provided in S1107 maybe the same as the feedback provided in S1110. For example, when thefeedback provided in S1107 is the audio feedback, the feedback providedin S1110 may be also the audio feedback and the message provided by theaudio feedback of S1110 comprise contents more helpful to the soundsleep than the message provided by the audio feedback of S1107. Forexample, the message provided by the audio feedback of S1106 is calmingclassic music, the message provided by the audio feedback of S1103 maybe class music.

Using one of the output of the camera unit 223, the output of the sensorunit 225 and the output of the GPS unit 226, it is detected whether theuser is drowsy and whether the current situation is corresponding to thefirst mode or the second mode. In another embodiment of the presentdisclosure, the first mode and the second mode may be set manually,using one or more of a button, a menu and a voice command of thewearable computing device. The feedbacks provided to the user accordingto the set mode may be the feedbacks mentioned above.

Meanwhile, when brightness of the lighting at the user's currentlocation is adjustable via a communication unit 222 of the wearablecomputing device 220, the lighting may be brighter to fight off theuser's drowsiness in the first mode and the lighting may be darker tohelp the user's sleep. In one embodiment, the current mode may beconverted into a standby mode of the wearable computing device 220 inthe second mode to help the user's sleep.

As mentioned above, the wearable computing device according to theembodiments of the present disclosure may detect whether the user isdrowsy or sleepy and determines whether the current situation allows thedrowsiness or not, when the user's drowsiness is detected. When thecurrent situation is the drowsiness-not-allowing situation, thecontroller may provide the user with the warning feedback. When thecurrent situation is corresponding to the drowsiness allowing situation,the controller may provide the user with the sleep-helpful feedback. Inthe situation not allowing the drowsiness, the wearable computing devicemay help the user fight off the drowsiness. In the situation allowingthe drowsiness, the wearable computing device may help the user sleepsound. Especially, the driving while drowsy may be prevented and a rateof traffic accidents caused by the driving while drowsy can be lowered.

Various variations and modifications of the refrigerator described aboveare possible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

What is claimed is:
 1. A wearable computing device comprising: adrowsiness detection unit configured to detect a user's drowsiness; acontroller configured to determine whether a current situationcorresponds to a first mode not allowing the user's drowsiness or asecond mode allowing the user's drowsiness when the user's drowsiness isdetected; and a feedback output unit configured to provide the user withat least one feedback comprising a message of the first mode or thesecond mode according to the mode determined by the controller, whereinthe message of the first mode is to fight off the drowsiness and whereinthe message of the second mode is to help the user's sleep.
 2. Thewearable computing device according to claim 1, wherein the drowsinessdetection unit detects the user's drowsiness, using at least one of theuser's eye blinking, the user's eye closing time, a state of the user'seyes, the user's pulsation, the user's brainwave, the user's bodytemperature and a line of the user's vision.
 3. The wearable computingdevice according to claim 1, further comprising: a Global PositioningSystem (GPS) unit configured to receive location information of thewearable computing device from one or more GPSs; and a camera unitconfigured to capture images in a range corresponding to the user's lineof vision and/or images of the user's surrounding, using one or morecameras.
 4. The wearable computing device according to claim 3, whereinthe controller determines whether the user is driving using one or moreof the images captured by the camera unit, the location informationreceived from the GPS unit and information sensed by one or more sensor,and the controller determines that the current situation iscorresponding to the first mode when the user is driving based on theresult of the determination.
 5. The wearable computing device accordingto claim 4, wherein the controller detects the user's location and placeusing one or more of the images captured by the camera unit, thelocation information received from the GPS unit and the informationsensed by one or more sensors when the user is not driving based on theresult of the determination, and the controller determines whether thecurrent situation corresponds to the first mode or the second mode basedon the detected location and place.
 6. The wearable computing deviceaccording to claim 1, wherein the first mode and the second mode are setmanually using at least one of a button, a menu and a voice commandprovided in the wearable computing device.
 7. The wearable computingdevice according to claim 1, wherein the at least one feedbackcomprising the message of the first mode comprise at last one of a firstaudio feedback, a first alarm feedback, a first video feedback and afirst brainwave feedback, and wherein the at least one feedbackcomprising the message of the second mode comprises at least one of asecond audio feedback, a second alarm feedback, a second video feedbackand a second brainwave feedback.
 8. The wearable computing deviceaccording to claim 7, wherein the feedback output unit comprises: anaudio output unit configured to output one of the first audio feedbackand the second audio feedback based on the control of the controller; analarm output unit configured to output one of the first alarm feedbackand the second alarm feedback based on the control of the controller; adisplay unit configured to output one of the first video feedback andthe second video feedback based on the control of the controller; and abrainwave output unit configured to output one of the first brainwavefeedback and the second brainwave feedback based on the control of thecontroller.
 9. The wearable computing device according to claim 7,wherein the first brainwave feedback is an alpha wave and the secondbrainwave is a theta wave.
 10. The wearable computing device accordingto claim 1, wherein the feedback provided to the user by the feedbackoutput unit to fight off the drowsiness and the message of the firstmode included in the feedback are determined by learning of the wearablecomputing device.
 11. The wearable computing device according to claim1, wherein the feedback provided to the user by the feedback output unitto fight off the drowsiness and the message of the first mode includedin the feedback are determined by the user.
 12. The wearable computingdevice according to claim 1, wherein the feedback provided to the userby the feedback output unit to help the user's sleep and the message ofthe second mode included in the feedback are determined by learning ofthe wearable computing device.
 13. The wearable computing deviceaccording to claim 1, wherein the feedback provided to the user by thefeedback output unit to help the user's sleep and the message of thesecond mode included in the feedback are determined by the user.
 14. Thewearable computing device according to claim 1, wherein the controllercontrols a brightness of lighting near the user based on whether thecurrent situation corresponds to the first mode or the second mode,using a wireless communication function.
 15. The wearable computingdevice according to claim 1, wherein the controller converts a mode ofthe wearable computing device into a standby mode when the currentsituation corresponds to the second mode.
 16. The wearable computingdevice according to claim 1, wherein the controller provides the userwith a feedback comprising a different message of the first mode whenthe user's drowsiness is detected after the feedback comprising themessage of the first mode is provided to the user for a preset timeperiod.
 17. The wearable computing device according to claim 1, whereinthe controller provides the user with a feedback comprising a differentmessage of the second mode, when the user's sleep is not detected afterthe feedback comprising the message of the second mode is provided tothe user.
 18. The wearable computing device according to claim 1,wherein the controller provides the user with the feedback comprisingthe message of the second mode when a mode conversion is requested bythe user while the feedback comprising the message of the first mode isprovided to the user.
 19. The wearable computing device according toclaim 1, wherein the controller provides the user with the feedbackcomprising the message of the first mode when a mode conversion isrequested by the user while the feedback comprising the message of thesecond mode is provided to the user.
 20. A method of a user interfacefor a wearable computing device, the method comprising: detectingwhether a user is drowsy; determining whether a current situationcorresponds to a first mode not allowing the user's drowsiness or asecond mode allowing the user's drowsiness when the user's drowsiness isdetected; and providing the user with at least one feedback comprising amessage of the first mode or the second mode according to the modedetermined in the step, wherein the message of the first mode is tofight off the drowsiness and wherein the message of the second mode isto help the user's sleep.